#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main() {
    int a, b;
    while (scanf("%d", &a) != EOF) {
        if (a > 0)
            printf("1\n");
        else if (a == 0)
            printf("0.5\n");
        else
            printf("0\n");
    }
    return 0;
}